<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>

function countSum(data) {
    var obj = {};
    return data.reduce(function(count, item) {
        if (item in count) {
            count[item]++;
        } else {
            count[item] = 1;
        }
        return count;
    }, {});
};
let str ='asdasdasdasdasdasd';
let arr = str.split("")
console.log(countSum(arr));


    </script>
</body>
</html>